Getting the size of a remote file

[Anon]

How do I obtain the size of a remote file in bytes? I simply need a function similar to filesize() that will work on remote files. Is there such a function?

Also, if I use a function such as ImageCreateFromJPEG() on a remote file, I am effectively creating a temporary copy of the file on my own server, correct? Is there any way to obtain the color index of a particular pixel in a (remote) image, without first making a (temp.) copy of it on my server's hd? Thank you for your help.

[[deleted]]

"Is there such a function?"

No.
Only the FTP protocol supports things like filesizes. HTTP requires that you download the entire file and just see how much you get.

"correct?"

In memory, yes, it's not on disk untill you save it.

"without first making a (temp.) copy of it on my server's hd? Thank you for your help."

Nope, you can't get pixels from images you don't have🙂 just like you can't look at an image without having it in memory.

[gerardg]

You might be able to use HTTP headers and see if there's a Content-Length header. There's also a way to just get the headers and not the file itself, but I don't remember at the moment.